I have been having a lot of xfinity voice issues. A tech came out and we plugged my main phone into the modem directly as it was deemed the wiring in my house was not good. Now I have a dial tone again.
When I try to make a call from my landline to my mom's landline (which is another xfinity line) the line on my end just rings and rings and rings. I call her from my cell phone and she answers and stated she picked up the phone and said hello, but all she hears is silence, but on my end I am hearing it ring to infinity.
So next I tried calling my cell phone from my home phone and it works fine. It makes a connection. I call her cell phone from my home phone and it connects. It only appears to be an issue when am making an xfinity landline to xfinity landlilne call.